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OWNER'S
Subwoofers
SOUNDSTREAM TECHNOLOGIES
120 Blue Ravine Road • Folsom • California 95630 USA
tel 916.351.1288 fax 916.351.0414
12
(REV A, 3/2/98)
MANUAL AND
INSTALLATION GUIDE
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SPL10, SPL12 AND SPL15 SUBWOOFERS
dB
dB
dB
dB
dB
dB
CONGRATULATIONS! You have chosen a superior product for
reproducing high "Sound Pressure Levels" in the car. This precision
component, when properly installed, is capable of amazing output
performance. The SPL10, SPL12 and SPL15 woofers are extremely high
output speakers with performance made possible through outstanding design
and exceptional quality in parts and construction.
Should your woofer ever require service or replacement, recording the
information below for your own records will help protect your investment.
Model Number:___________________________________________________________
Serial Number: ___________________________________________________________
Dealer’s Name: __________________________________________________________
Date of Purchase: ________________________________________________________
Installation Shop: _________________________________________________________
Installation Date: _________________________________________________________
DESIGN FEATURES
• Long Excursion Designs -- The SPL woofers use high performance components and the
New Ultra-Excursion Surround to achieve extra long excursion for high output and deep
bass.
• Heavy Gauge Steel Baskets provide extra rigidity and damping.
• Silver Powder Coating ensures durability and lasting good looks.
• Ultra-High power handling Voice Coils with Kapton/Epoxy formers increase power
handling and performance. Aerospace grade adhesives and materials insure longevity and
high performance.
• Dual Voice Coil Inputs for increased flexibility in optimizing installations.
• Computer Numerically Controlled (CNC) machined magnet plates and pole piece
precisely focus the magnetic energy for optimum performance.
• High Emissivity Coatings on all steel plates improve power handling.
• Large Magnet Structures for powerful, well-controlled output.
• Vented Pole Pieces for greater voice coil cooling.
• Custom-designed High Strength Spiders control the long travel cone assembly.
2
Sealed (Cont'd)
• 3.0 ft
3
- Good linear
response, excellent
all around enclosure.
Vented
• 2.0 ft
3
@ 50 Hz
(Three 4" x 12.25"
ports) - High output
with good low
frequency extension.
Good small
enclosure.
• 3.0 ft
3
@ 40 Hz
(Three 4" x 13"
ports) - High output
with excellent low
frequency extension.
Great for Rock
music or home
theater applications.
• 4.0 ft
3
@ 30 Hz
(Three 4" x 18.75"
ports) - High output
with low frequency
extension. Great for
Rock music or home
theater applications.
Sealed Bandpass
• Rear = 3.0 ft
• Front = 2.2ft
3
sealed
3
@ 55
Hz (Three 4" x 6.75"
ports) - High output
with good low
frequency extension.
Good for Rock or
Rap.
• Rear = 1.5 ft
• Front = 2.2 ft
3
sealed
3
@
72Hz (Four 4" x 5"
ports) - Very high
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
110
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
110
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
110
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
110
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
Frequency Hz
Frequency Hz
Frequency Hz
Frequency Hz
Frequency Hz
Frequency Hz
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Vented (V)
Sealed
Bandpass
Page 3
Vented (Cont'd)
dB
dB
dB
dB
dB
• 1.0 ft
3
@ 40Hz (4" x
14.25" port) - Small,
versatile enclosure
with good bass.
Great for Rock music
or home theater.
• 1.0 ft
3
@ 50Hz (4" x
8" port) - Small
enclosure with good
punch. Good for Rap
or Rock.
Sealed Bandpass
• Rear = 1.0 ft
• Front = 1.5 ft
3
sealed
3
@ 60
Hz (Three 4" x
11.25" ports) - Very
high output, narrow
response. Good for
Rap, Rock and SPL!
Boomer!
• Rear = 1.0 ft
• Front = 1.0 ft
3
sealed
3
@
55Hz (Two 4" x
14.75" ports) - Great
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
110
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
Frequency Hz
Frequency Hz
Frequency Hz
Frequency Hz
Sealed Bandpass
(SBP)
Infinite Baffle
• Excellent performance for all types of music at moderate levels.
Sealed
• 1.5 ft
3
- Good linear
response, excellent
small enclosure.
Excellent for high
SPL, multiple driver
applications.
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
Frequency Hz
Sealed (S)
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SPECIFICATIONS & THIELE/SMALL PARAMETERS
Frequency Response (Hz)
Sensitivity (2.83v/1m)
Impedance (nominal Z, ohms)
Rated Program Power, Watts
Fs (Hz)
Qts
Qms
Qes
EBP (Fs/Qes)
Vas (ft3)
Vas (liters)
Vas (m3)
Cms (um/N)
DCR (ohms)
Levc (mH) @ 1 KHz
BL (Tesla m)
Sd (in2)
Sd (m2)
Sd (cm2)
X max; one way (linear mm)
X max; one way (peak mm)
Vd (linear cm3)
Vd (peak cm3)
Vd (linear m3)
Vd (peak m3)
Mms (grams)
Magnet Assembly (oz)
Magnet Weight (oz)
Vf (volume of frame, in3)
SPL10 SPL12 SPL15
32-500 30-500 25-500
92 dB 94 dB 95 dB
2 2 2
250 300 400
33 30 23
.528 .362 .360
8.31 4.77 9.22
.564 .391 .380
58.5 76.7 60.5
1.51 3.20 9.82
43 91 278
.043 .091 .278
267 245 229
1.53 1.53 1.60
1.2 1.2 1.80
7.06 9.26 11.20
52.1 76.0 143
.034 .049 .092
336 490 924
6.6 6.6 7.6
19 21 30
222 323 702
638 1029 2772
.000222 .000323 0.000702
.000638 .001029 0.002772
90.0 118 201
136 172 238
42 58 100
135 200 320
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SELECTING AN ENCLOSURE
dB
dB
dB
dB
dB
There are several different enclosure designs for different applications.
The SPL subwoofers work very well in all of the following enclosure
designs. It is up to you to select the specific enclosure that will work
the best for your particular application.
Infinite Baffle
Infinite baffle is the simplest type of subwoofer installation. In this type
of installation, the woofer(s) is mounted to a baffle which is then
mounted to either the rear deck or back seat of the vehicle. The best
results are achieved when the trunk area is virtually airtight and
isolated from the passenger compartment.
Pros Cons
• Excellent low frequency extension
• Excellent transient response
• Uses almost no trunk space
Sealed Enclosure
Sealed enclosures are relatively simple to build and install, as all that is
required is an airtight box. The larger the sealed enclosure, the more
the performance resembles that of an infinite baffle installation.
Pros Cons
• Very good low frequency ex-
• Medium efficiency
tension
• Very good transient response
• High power handling
Vented Enclosure
Vented enclosures use a sealed enclosure with a vent or port in the box
which is tuned to resonate at a specific frequency.
Pros Cons
• Good low frequency extension down to the tuning frequency
• High power handling down
to the tuning frequency
• Higher output than sealed
enclosures
• Low power handling
• Almost no output be-
• Lower power handling
• Low to medium efficiency
Sealed (S)
below the tuning frequency
low the tuning frequency
Vented (V)
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Sealed Bandpass
• Rear = 1.5 ft
• Front = .75 ft
3
sealed
3
@ 48
Hz (4" x 13" port) -
High output with
good low frequency
extension. Good for
Rock or Rap.
• Rear = .5 ft
• Front = .75 ft
3
sealed
3
@
66Hz (4" x 5.25"
port) - Very high
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
Frequency Hz
Frequency Hz
Sealed Bandpass
(SBP)
output. Great for
Rap music.
Infinite Baffle
• Excellent performance for all types of music at moderate levels.
Sealed
• .5 ft
3
- Good linear
response, excellent
small enclosure.
Excellent for high
SPL, multiple driver
applications.
• 1.0 ft
3
- Good linear
response, excellent
all around enclosure.
Vented
• 1.5 ft
3
@ 33Hz (4" x
14" port) - Deep
bass, flat response.
Good small
enclosure.
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
Frequency Hz
Frequency Hz
Frequency Hz
Sealed (S)
Vented (V)
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Page 5
dB
dB
dB
dB
Infinite Baffle
Sealed
• .5 ft
3
- Good linear
response, excellent
small enclosure.
Excellent for high
SPL, multiple driver
applications.
• 1.5 ft
3
- Good linear
response, excellent
all around enclosure.
Vented
• .75 ft
3
@ 50 Hz (4" x
11.5" port) - High
output. Good small
enclosure.
• 1.0 ft
3
@ 40 Hz (4" x
14.25" port) - High
output with good low
frequency extension.
Great for Rock
music.
SUGGESTED ENCLOSURES
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
105
100
95
90
85
80
75
70
65
60
55
50
10 100 1000
Frequency Hz
Frequency Hz
Frequency Hz
Frequency Hz
Sealed (S)
Vented (V)
Sealed Bandpass Enclosure
Sealed bandpass enclosures enclose both sides of the
woofer(s). An airtight enclosure is built around the front and back of
the woofer and one chamber is ported to a specific frequency.
Pros Cons
• High power handling
within the operating frequencies
• Very high output within
the range of the operating frequencies
• Low power handling
beyond the tuning frequency
• Poor to moderate
transient response
• Poor low frequency
extension
Sealed Bandpass
(SBP)
CALCULATING (NET) INTERNAL ENCLOSURE VOLUMES
When constructing any type of enclosure, you must be aware that the
outside dimensions DO NOT represent the true (Net) volume inside.
Such things as woofers, ports, thickness of enclosure material, dividing
walls, and any internal bracing will reduce the total amount of the
actual air space available. The following worksheet has been designed
to provide you with the necessary steps to accurately calculate the
absolute (Net) internal volume of any given enclosure.
Calculating Cylindrical Port Volume
1. Measure the outside diameter of the port and divide by 2 for the
radius.
2. Square the radius and multiply by 3.14 (π) to arrive at outside port
area.
3. Multiply the area by the length of
the port inside the enclosure for the
port volume.
length inside
enclosure
outside
diameter
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ENCLOSURE VOLUME FLOWCHART
M easure maximum possible dimension s
M ultiply wall thickness by 2
Subtract this from each dimension to
arrive at Gross Internal Dimensions
M ultiply LxWxD to ar rive at
Gross Internal Volume
BUILDING THE ENCLOSURE
• Determine the dimensions of your enclosure.
• Be certain the box you have designed will fit into the location you have
chosen. Sometimes making a cardboard box with the same outside
dimensions is helpful.
• Use 3/4 inch thick Medium Density Fiberboard (MDF) or High Density
Particleboard. It is preferable to cut the wood with a table saw to ensure
straight, even joints. If a table saw is not available, a circular saw is
acceptable.
• Use a “T” square to verify precise right angle gluing.
• Use a high quality wood glue and air nails or wood screws to assemble the
enclosure. Elmer’s woodworker’s glue and Weldwood work well. To
guarantee an airtight box, seal each inside joint with silicone sealant.
• For Sealed Enclosures, stuff the chamber with 50-75% filling (approximately
1.5 pounds per cubic foot) of fiberglass insulation or Dacron.
Deduct Vf (volume of the speaker frame)
Deduct Vf (volume of the speaker frame)
from Gross Internal Volume
from Gross Internal Volume
Braces?
No Yes
Calculate br ace volume and deduct
from Gross Internal Volume
You are at Net Internal Volume
in cubic inches (in )
3
To convert to LITERS:
Divide in by 61.03
To convert to CUBIC FEET:
Divide in by 1728
3
3
• For Vented Enclosures, staple 1 inch thick fiberglass insulation or Dacron to
all walls of the enclosure except the baffle to which the woofer is mounted.
• Use the supplied gasket to seal the woofer in the enclosure and eight(8)
wood screws or T-nuts and bolts. Progressively tighten each of the bolts or
screws to prevent warping the woofer frame.
• Use slide-on connectors to attach speaker wires. Do not solder wires to the
SUGGESTED ENCLOSURES
The following designs include a variety of enclosure sizes and types.
Each design has two frequency response curves; one showing predicted
“In-Car” response, and the other showing “Half-Space Anechoic” (out-of-car)
frequency response. The performance difference between the two curves is a
result of the natural acoustics of an “average” automotive environment. This
“average” transfer function is only an approximation of what you may expect to
see in your car. Every car is different. Each curve was generated using 2.83
Volts across both voice coils in parallel and measured at 1 meter. Also, each
frequency response curve includes a 12 dB/octave low pass at 100 Hz for
sealed and vented enclosures and 200 Hz for bandpass enclosures. The
response curves can help you visualize relative performance differences
between designs. Read through the descriptions given for each enclosure and
select the one that suits your needs.
Remember: all suggested enclosure volumes are Net, and DO NOT include
woofer, port, and bracing displacement!
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